    DataGridField('InvoiceDetails',
                searchable = True,
                columns=("num_titre","date_prestation","code_prestation"),
                         #"date"),
                         #"prestation"),
                         
                         #, "nombre", "brut", "net", "heure", "ppers", "executant"),
                allow_empty_rows = False,
                widget = DataGridWidget(
                    auto_insert = False,     
                    description="Automatically insert new rows when the last row is being filled",
                    columns={
    'num_titre' : Column("Titre XXX"),
    'date_prestation' : SelectColumn("Date prestation", vocabulary="getDatesPrestations"),
                                #default="default2"),
    'code_prestation' : SelectColumn("Code prestation", vocabulary="getCodesPrestations", default="sample2"),
    },
                    ),                 
                  ),

    ),
